61215635712 has 216 divisors, whose sum is σ = 206753232672. Its totient is φ = 15900057600.

The previous prime is 61215635707. The next prime is 61215635771. The reversal of 61215635712 is 21753651216.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 340012 + ... + 487892.

It is an arithmetic number, because the mean of its divisors is an integer number (957190892).

Almost surely, 2^61215635712 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61215635712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103376616336).

61215635712 is an abundant number, since it is smaller than the sum of its proper divisors (145537596960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61215635712 is a wasteful number, since it uses less digits than its factorization.

61215635712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147925 (or 147904 counting only the distinct ones).

The product of its digits is 75600, while the sum is 39.

The spelling of 61215635712 in words is "sixty-one billion, two hundred fifteen million, six hundred thirty-five thousand, seven hundred twelve".